Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ef31bbe6aad9f3…

MALICIOUS

PDF

80.2 KB Created: 2021-09-19 23:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d745aae225b8bb9930f21a0070057509 SHA-1: 90c2230b408f1662bc649b62c92710817425f092 SHA-256: b1ef31bbe6aad9f3ad77b05d62f86c0662d1ce4f7e5dde8cb5525e8335597e05
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many pointing to disposable domains, and is identified as a link farm. The presence of embedded JavaScript, though not directly executable in this PDF context, suggests a potential for malicious scripting if the PDF were to be processed in a way that allows script execution, or if it's part of a larger phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://cofetariafraguta.ro/UserFiles/file/2715458361.pdf In PDF document text
    • https://cargotavio.ru/files/file/94030661804.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/22772323696.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/95746846136.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/365165353.pdfIn PDF document text
    • http://allycatering.com/userfiles/16321120213.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/wobekiwebipevug.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/98914043434.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2b0c3dffb---50827570996.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/gomivigatifidajezuwipeko.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/25115869466.pdfIn PDF document text
    • https://tsolisp.com/files/file/xegasafipoworabilugemuj.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/71957989838.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/5466310251.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210907_203228.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/1487416510.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/10377505688.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/simapelogipun.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/betanetotoda.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/jawepadim.pdfIn PDF document text
    • https://mashura.co/userfiles/files/40572097934.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/kezosikuxukakuxujozobu.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/getusufiri.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/9395300530.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/dezabesokaboligisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=pokemon+sword+and+shield+game+apk+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F6 19772 bytes
SHA-256: a0adddc3594f5e95efdb2857c41d400ba66de3f0988c7f866640795a22566a25
font_02_sfnt_off000119de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DE 10920 bytes
SHA-256: cad7205fffd0963c40999b53b061d87bf11703dacdb8de2c09a2adf03d4b1106